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Microphotonics is a branch of technology that deals with directing light on a microscopic scale and is used in optical networking. Particularly, it refers to the branch of technology that deals with wafer-level integrated devices and systems that emit, transmit, detect, and process light along with other forms of radiant energy with photon as the quantum unit. [1]


Microphotonics employs at least two different materials with a large differential index of refraction to squeeze the light down to a small size. Generally speaking, virtually all of microphotonics relies on Fresnel reflection to guide the light. If the photons reside mainly in the higher index material, the confinement is due to total internal reflection. If the confinement is due many distributed Fresnel reflections, the device is termed a photonic crystal. There are many different types of geometries used in microphotonics including optical waveguides, optical microcavities, and Arrayed waveguide gratings.

Photonic crystals

Photonic crystals are non-conducting materials that reflect various wavelengths of light almost perfectly. Such a crystal can be referred to as a perfect mirror. Other devices employed in microphotonics include micromirrors and photonic wire waveguides. These tools are used to "mold the flow of light", a famous phrase for describing the goal of microphotonics. The crystals serve as structures that allow the manipulation, confinement, and control of light in one, two, or three dimensions of space. [2]

Microdisks, microtoroids, and microspheres

Silica optical microdisk (courtesy http://copilot.caltech.edu Silica optical microdisk.jpg
Silica optical microdisk (courtesy http://copilot.caltech.edu

An optical microdisk, optical microtoroid, or optical microsphere uses internal reflection in a circular geometry to hold on to the photons. This type of circularly symmetric optical resonance is called a Whispering gallery mode, after Lord Rayleigh coined the term.


Microphotonics has biological applications and these can be demonstrated in the case of the "biophotonic chips", which are developed to increase efficiency in terms of "photonic yield" or the collected luminescent signal emitted by fluorescent markers used in biological chips. [3]

Currently, microphotonics technology is also being developed to replace electronics devices and bio-compatible intracellular devices. [4] For instance, the long-standing goal of an all-optical router would eliminate electronic bottlenecks, speeding up the network. Perfect mirrors are being developed for use in fiber optic cables.

See also

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  1. Jamroz, Wes; Kruzelecky, Roman; Haddad, Emile (2006). Applied Microphotonics. Boca Raton, FL: CRC Press. p. 1. ISBN   9780849340260.
  2. Minoli, Daniel (2006). Nanotechnology Applications to Telecommunications and Networking. Hoboken, NJ: John Wiley & Sons, Inc. Publication. p. 151. ISBN   9780471716396.
  3. Rigneault, Hervé; Lourtioz, Jean-Michel; Delalande, Claude; Levenson, Ariel (2006). Nanophotonics. London: iSTE Ltd. p. 81. ISBN   9781905209286.
  4. Fikouras, Alasdair H.; Schubert, Marcel; Karl, Markus; Kumar, Jothi D.; Powis, Simon J.; Di Falco, Andrea; Gather, Malte C. (16 November 2018). "Non-obstructive intracellular nanolasers". Nature Communications. 9 (1): 4817. arXiv: 1806.03366 . doi:10.1038/s41467-018-07248-0. PMC   6240115 . PMID   30446665.